INSAT-4E

INSAT-4E, also known as GSAT-6, is a member of the INSAT family and is a multimedia communication satellite that will offer a Satellite Digital Multimedia Broadcasting (S-DMB) service across several digital multimedia terminals or consoles which can be used to provide information services to vehicles on the fly and to the mobile phones. The satellite can be used for other social and strategic applications.[1]

INSAT 4E
Mission typeCommunication
OperatorINSAT
COSPAR ID2015-041A
SATCAT no.40880
Websitehttp://www.isro.gov.in/gslv-d6/gslv-d6-gsat-6-live-launchpad
Mission durationPlanned: 9 years
Elapsed: 4 years, 11 months, 19 days
Spacecraft properties
BusI-2K
ManufacturerISRO Satellite Centre
Space Applications Centre
Launch mass2,117 kilograms (4,667 lb)
Power2 kilowatts
Start of mission
Launch date27 August 2015, 11:22 (2015-08-27UTC11:22Z) UTC
RocketGSLV Mk.II D6
Launch siteSatish Dhawan SLP
ContractorISRO
Orbital parameters
Reference systemGeocentric
RegimeGeostationary
EpochPlanned
Transponders
Band5, C x S transponders (9 megahertz bandwidth)
5, S x C transponders (2.7 megahertz bandwidth)
 

Satellite

INSAT-4E has five C x S transponders each of 9 MHz bandwidth and five S x C transponders each of 2.7 MHz bandwidth which will together cover the entire country.[2]

Launch

ISRO successfully launched INSAT-4E on 27 August 2015, using a GSLV D6 Mk.II rocket flying from the Satish Dhawan Space Centre and inserted into a Geostationary Transfer Orbit (GTO) with injection parameters of 170 km x 35945 km, 19.96 degree inclination.[3]

Orbit raising

Maneuvers to move the satellite into its designated geosynchronous orbit at 83 degrees East longitude were initiated on 28 August 2015 by firing motors on board the GSAT-6 satellite.

The GSAT-6 satellite's Liquid Apogee Motor (LAM) was fired for 3385 seconds at 08:35 hours IST on August 28 during the first orbit raising operation and modified the satellite orbit to 8,408 km (perigee height) by 35,708 km (apogee height) with an inclination of 7.5 degree and an orbital period of 13 hours, 15 minutes and 24 seconds.[4][5]

Second orbit raising operation of GSAT-6 was successfully completed by firing the Apogee Motor for 2663 seconds at 11:10:53 hours IST on Aug 29, 2015. Realized orbit was 26,998 km (perigee height) by 35,682 km (apogee height) with an inclination of 0.115 degree and an orbital period of 20 hours and 15 minutes.[6]

Third orbit raising operation of GSAT-6 was successfully completed by firing the Apogee Motor for 580.32 seconds at 07:46 hours IST on Aug 30, 2015. Deployment of the unfurlable antenna (UFA) also successfully completed with this.[7] The satellite was at 78 degrees east longitude and was drifting towards its final slot at 83 degrees east.

GSAT-6 was successfully positioned in its orbital slot of 83 degree east and collocated with INSAT-4A, GSAT-12, GSAT-10 and IRNSS-1C on September 6, 2015 morning, after carrying out four drift arresting maneuvers.[8]

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See also
Main article: Mission Shakti

References
  1. "ISRO proposes INSAT-4E satellite". spacedaily.com. Retrieved 2012-05-29.
  2. "Space Application center". sac.gov.in. Retrieved 2012-05-29.
  3. "ISRO's GSLV D-6 puts GSAT-6 satellite in orbit". The Hindu. 27 August 2015.
  4. "First orbit raising operation of GSAT-6 completes successfully". Press Trust of India. PTI. 29 August 2015.
  5. "GSAT-6 Update: First orbit raising operation of GSAT-6 was successfully completed". isro.org. Archived from the original on 31 August 2015. Retrieved 30 August 2015.
  6. "Second orbit raising operation of GSAT-6 was successfully completed". isro.org. Retrieved 30 August 2015.
  7. "Third orbit raising operation of GSAT-6 was successfully completed". isro.org. Retrieved 30 August 2015.
  8. "GSAT-6 has been successfully positioned in its orbital slot". isro.org.

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